Move some *at definitions to syscalls.list (bug 14138)

[Rich Felker]

On Tue, Sep 30, 2014 at 05:24:10PM +0000, Joseph S. Myers wrote:
> On Tue, 30 Sep 2014, Rich Felker wrote:
> 
> > On Mon, Sep 29, 2014 at 11:16:32PM +0000, Joseph S. Myers wrote:
> > > Continuing the move of syscall definitions to syscalls.list, where the
> > > removal of support for old kernel versions has made this possible,
> > > this patch moves definitions of various *at functions in
> > > sysdeps/unix/sysv/linux/.
> > 
> > I think this is premature. Some of these functions, especially
> > fchmodat, have serious bug reports open against them which cannot be
> > fixed if they're pure syscall wrappers. See:
> > 
> > https://sourceware.org/bugzilla/show_bug.cgi?id=14578
> 
> My patch did not change fchmodat because the implementation isn't simply a 
> syscall wrapper (the C function has an extra argument).  For anything 
> that's currently a syscall wrapper in glibc, there is no point in it being 
> a C wrapper rather than a syscalls.list entry simply because some future 
> change might require such a wrapper; it can be converted to C at the point 
> where a C implementation is needed.

Sounds ok then.

Rich